TITLE:
Smart Microcavity on the Tip of Multi-Core Optical Fiber for Gas Sensing
AUTHORS:
Yuqian Zheng, Shengfei Feng
KEYWORDS:
WGM Optical Microcavities, Dual Coupled Microcavity, Bonding and Anti-Bonding Mode, Organic Gas Sensing
JOURNAL NAME:
Optics and Photonics Journal,
Vol.13 No.7,
July
31,
2023
ABSTRACT: We designed and fabricated a smart microcavity sensor with a vertically coupled structure on the end face of a multi-core fiber using two-photon lithography technology. The influence of gap in vertical coupling structure on the resonance characteristics of bonding and anti-bonding modes in the transmission spectrum was studied through simulation and experiments. The results indicate that the bonding and anti-bonding modes generated by the vertical coupling of the two microcavities, as well as the changes in the radius and refractive index of the micro-toroid, and the distance between the microcavities caused by the absorption of vapor during the gas sensing process, exhibit different wavelength shifts for the two resonant modes. Smart microcavity sensors exhibit sensitivity and sensing characteristics.